Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

OK, this doesn't solve the exact problem that was asked, but this is how I accomplished the task I set out to complete when looking for this answer. I hope this helps others...

Scenario:
I was moving large amounts of files/folders to a new computer and wanted to avoid moving large unnecessary files. I landed on this page because I just wanted to open a folder and see the sizes of all the subfolders so that I could go into the large ones and delete unnecessary files.

Maybe this is what you're trying to do too. This may seem obvious, but here was my workaround:

Solution:
Just open the folder that you want to investigate and in the upper-right you'll see the "Search ..." box. Just type * (asterisk) in there, hit <Enter> and you'll be shown all files in all subfolders. Just below the search box change the view to "Details" so you can see the file sizes and sort by the "Size" column.

This is how I identified the large files I didn't want across many subfolders. I didn't really care about the folder sizes, but I thought that's what I needed to solve my problem.

You can do this at any folder level of course, it just takes longer the more folders you're trying to process at once.

Again, doesn't answer the specific question, but might answer the root question of someone who lands on this page.

Folder Size in Windows Explorer

Is 24.1 GB Excessive for Windows Folder Size (Pro)?I'm trying to save some space on my cramped SSD. My Windows folder is 24.1 GB, and of this subfolder winsxs is 13.2 GB, subfolder installer is 3.2 GB, subfolder System32 is 2.4 GB, assembly subfolder 1.4 GB and sysWOW64 is 1.2 GB. Those are the biggies. Am I stuck with these sizes or is there...

Performance & Maintenance

How do I show file FOLDER size in windows explorerWhen we open our storage HD for media (flicks and TV) and other folders with files and or other folders inside the File FOLDER. the command bar shows a column for size, length, date, etc but it shows no information. We'd mostly like to see the size of the file FOLDER with the files and folders in...

Customization

Windows Folder Size 24gbI have Windows 7 x64 Ultimate and noticed that my c:\windows folder size is 24gbs!
Is this normal?
My Temp folder is 5.4GBs, not sure if it's safe to clean out the files in that folder...

Performance & Maintenance

Folder Size, like Disk Size addon/app?I've been wanting to see how much space folders take up, like how Disks display them when you open My Computer. Is there such an addon to Explorer, or recommend any free apps that do this?
Pic attached is of Disks, but I want Folders to do the same thing:

Software

Can't view folder size on backup drive with ExplorerWhen I backup to an external USB drive, Explorer shows the 2 folders created (WindowsImageBackup and MYNAME-PC) as having 0 bytes, 0 files and 0 folders when right clicking those folders and looking at Properties.
Yet, if I right click the drive icon, Properties shows the drive with 15GB of used...